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High-salt high-COD wastewater treatment zero emission process and device

A wastewater treatment and treatment device technology, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve the problems of thick wastewater, affecting the life of the evaporator, and unable to further evaporate, etc., to achieve Effects of reducing evaporation energy consumption, solving reverse osmosis membrane fouling, and solving high osmotic pressure problems

Pending Publication Date: 2018-12-21
江苏环保产业技术研究院股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the high-salt wastewater contains a large amount of organic matter, it will affect the evaporation efficiency. If the organic matter has a large molecular weight, it will even cause the waste water to become viscous when the evaporation is concentrated to a certain extent, and it cannot be further evaporated, which will also affect the life of the evaporator.

Method used

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  • High-salt high-COD wastewater treatment zero emission process and device

Examples

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Effect test

Embodiment 1

[0056] The water quality of high-salt and high-COD wastewater in an enterprise is as follows: the salt concentration is 5%, the COD is 3230 mg / L, the pH is 6.3, and the temperature is 27°C. Firstly, the waste water is passed through the tubular Al with an average pore size of 5nm 2 o 3 Ceramic membrane treatment removes suspended solids in wastewater, the operating pressure is 0.4 MPa, and the membrane surface velocity is controlled at 2m / s. The wastewater treated by the ultrafiltration membrane enters the electrodialysis treatment device, the operating voltage is 80 V, and the current is 2A. The COD of the desalted fresh water after electrodialysis treatment is 3020 mg / L, and the salt concentration is 0.5%. , The reverse osmosis membrane material is polyimide, the operating pressure is 1.2MPa, after the wastewater is concentrated 5 times, the concentrated water enters the low-temperature evaporation device for treatment, and the effluent is reused. The COD of the high-conc...

Embodiment 2

[0058] The water quality of high-salt and high-COD wastewater in a papermaking enterprise is: the salt concentration is 15%, the COD is 47850 mg / L, the pH is 6.9, and the temperature is 20°C. Firstly, the wastewater is treated with a plate-type PVDF ultrafiltration membrane with an average pore size of 20nm to remove suspended solids in the wastewater. The operating pressure is 0.3 MPa, and the membrane surface velocity is controlled at 3 m / s. The wastewater treated by the ultrafiltration membrane enters the electrodialysis treatment device with an operating voltage of 120 V and a current of 3 A. The COD of the desalted fresh water after electrodialysis treatment is 47201 mg / L, and the salt concentration is 1.2%. Osmosis treatment device, the reverse osmosis membrane material is cellulose acetate, the operating pressure is 1.5 MPa, after the wastewater is concentrated by 3 times, the concentrated water enters the low-temperature evaporation device for treatment, and the efflue...

Embodiment 3

[0060] The water quality of high-salt and high-COD wastewater in a printing and dyeing enterprise is: the salt concentration is 23%, the COD is 32500 mg / L, the pH is 7.8, and the temperature is 25°C. Firstly, the waste water is passed through the tubular Al with an average pore size of 50nm 2 o 3 Ultrafiltration ceramic membrane treatment removes suspended solids in wastewater, the operating pressure is 0.2 MPa, and the membrane surface velocity is controlled at 5 m / s. The wastewater treated by the ultrafiltration membrane enters the electrodialysis treatment device with an operating voltage of 190 V and a current of 4 A. The COD of the desalted fresh water after electrodialysis treatment is 31200 mg / L, and the salt concentration is 3%. Osmosis treatment device, the reverse osmosis membrane material is polyimide, the operating pressure is 1.8MPa, after the wastewater is concentrated twice, the concentrated water enters the low-temperature evaporation device for treatment, an...

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Abstract

The invention discloses a high-salt high-COD wastewater treatment zero emission process and device. The device comprises an ultrafiltration membrane filtering device, an electrodialysis treatment device, an oxidation treatment device, a reverse osmosis treatment device and a low temperature evaporation device, wherein the ultrafiltration membrane filtering device is used for filtering high-salt high-COD wastewater to remove suspended solids in the wastewater; the electrodialysis treatment device is connected with the ultrafiltration membrane filtering device and is used for performing electrodialysis treatment on water produced by using the ultrafiltration membrane filtering device and used for separating high-concentration salt water from high-COD fresh water; the oxidation treatment device is connected with the electrodialysis treatment device and is used for oxidizing the high-COD fresh water produced by using the electrodialysis treatment device; the reverse osmosis treatment device is connected with the oxidation treatment device and is used for filtering water produced by using the oxidation treatment device and used for separating reverse osmosis effluent from reverse osmosis high-concentration salt water; the low temperature evaporation device is connected with the electrodialysis treatment device and the reverse osmosis treatment device and is used for performing evaporation crystallization treatment on the high-concentration salt water produced by using the electrodialysis treatment device and the reverse osmosis high-concentration salt water produced by using thereverse osmosis treatment device.

Description

technical field [0001] The invention relates to a zero-discharge process and device for treating high-salt and high-COD wastewater, belonging to the field of wastewater treatment. Background technique [0002] A large amount of waste water with high salt content and high COD will be discharged in the process of chemical industry, dyestuff, printing and dyeing, papermaking and other industries. This kind of waste water has a high salt content of 1 ~ 25%, COD up to 5000 ~ 50000 mg / L, and The composition of wastewater is complex and even highly toxic. Direct discharge into natural water will cause immeasurable damage to the environment; direct treatment into commonly used biochemical systems will cause a huge impact on the biochemical system, affect the quality of effluent water, and even cause the death of microorganisms. . After biochemical treatment, the salt in the wastewater still exists, and the subsequent treatment process still needs to be concentrated and desalinated....

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F1/4693C02F1/441C02F1/444C02F1/4672C02F1/72C02F1/725C02F1/78
Inventor 陈朋利吴伟吴云波吴海锁谢祥峰
Owner 江苏环保产业技术研究院股份公司
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